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(2*x^2)/3-((17*x^1)/3)-9 = 0
(2*x^2)/3+(-17/3)*x-9 = 0
2/3*x^2-17/3*x-9 = 0
DELTA = (-17/3)^2-(-9*2/3*4)
DELTA = 505/9
DELTA > 0
x = ((505/9)^(1/2)+17/3)/(2/3*2) or x = (17/3-(505/9)^(1/2))/(2/3*2)
x = 3/4*((505/9)^(1/2)+17/3) or x = 3/4*(17/3-(505/9)^(1/2))
x in { 3/4*(17/3-(505/9)^(1/2)), 3/4*((505/9)^(1/2)+17/3) }
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